Cover plate for a support arm



FIG. 1 is a front, top and right side perspective view of a cover plate for a support arm showing my new design;

FIG. 2 is a rear, bottom and right side view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is another front, top and right side perspective view thereof, shown in an environment of use.

The dashed broken lines are for illustrating environment structure only and form no part of the claimed design. 

CLAIM The ornamental design for a cover plate for a support arm, as shown and described. 